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Ridge-type roughness: from turbulent channel flow to internal combustion engine

Deyn, Lars H. von ; Schmidt, Marius ; Örlü, Ramis ; Stroh, Alexander ; Kriegseis, Jochen ; Böhm, Benjamin ; Frohnapfel, Bettina (2024)
Ridge-type roughness: from turbulent channel flow to internal combustion engine.
In: Experiments in Fluids, 2022, 63 (1)
doi: 10.26083/tuprints-00023460
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: Ridge-type roughness: from turbulent channel flow to internal combustion engine
Language: English
Date: 19 March 2024
Place of Publication: Darmstadt
Year of primary publication: January 2022
Place of primary publication: Berlin ; Heidelberg
Publisher: Springer
Journal or Publication Title: Experiments in Fluids
Volume of the journal: 63
Issue Number: 1
Collation: 16 Seiten
DOI: 10.26083/tuprints-00023460
Corresponding Links:
Origin: Secondary publication DeepGreen

While existing engineering tools enable us to predict how homogeneous surface roughness alters drag and heat transfer of near-wall turbulent flows to a certain extent, these tools cannot be reliably applied for heterogeneous rough surfaces. Nevertheless, heterogeneous roughness is a key feature of many applications. In the present work we focus on spanwise heterogeneous roughness, which is known to introduce large-scale secondary motions that can strongly alter the near-wall turbulent flow. While these secondary motions are mostly investigated in canonical turbulent shear flows, we show that ridge-type roughness — one of the two widely investigated types of spanwise heterogeneous roughness — also induces secondary motions in the turbulent flow inside a combustion engine. This indicates that large scale secondary motions can also be found in technical flows, which neither represent classical turbulent equilibrium boundary layers nor are in a statistically steady state. In addition, as the first step towards improved drag predictions for heterogeneous rough surfaces, the Reynolds number dependency of the friction factor for ridge-type roughness is presented.

Uncontrolled Keywords: Engineering Fluid Dynamics, Fluid- and Aerodynamics, Engineering Thermodynamics, Heat and Mass Transfer
Identification Number: Artikel-ID: 18
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-234608
Classification DDC: 600 Technology, medicine, applied sciences > 620 Engineering and machine engineering
Divisions: 16 Department of Mechanical Engineering > Institute of Reactive Flows and Diagnostics (RSM)
Date Deposited: 19 Mar 2024 13:54
Last Modified: 22 Apr 2024 09:53
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/23460
PPN: 517270943
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